Cell structure and organellesIB MYP Sciences: Mind map

Exam questions on Cell structure and organelles

1. A biology class in Nairobi compares cells from three sources under a microscope: cells from a cheek swab, cells from a leaf of pondweed, and bacteria from a sample of yoghurt.
   Outline two ways in which the structure of a bacterial cell from the yoghurt differs from that of a cheek cell.2 marks
2. Researchers compare cells from a long-distance runner's thigh muscle with skin cells from her arm. The muscle cells need a large, continuous supply of energy for running, and under the microscope they contain many more mitochondria than the skin cells.
   Explain why the runner's muscle cells contain many more mitochondria than her skin cells.2 marks
3. A horticulturalist in the Netherlands grows lettuce. On a hot day the unwatered lettuce leaves wilt and droop, but after watering they become firm again. She examines a lettuce leaf cell and a cheek cell and notes the differences in their structures.
   Describe the function of each of these structures in a lettuce leaf cell: the cell wall, the chloroplasts and the permanent vacuole.3 marks